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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a691715c7746be488bd7faad602f16351158856cc51a3b6d2f59622e136e53e9' 
  AND token = 'rJUvUoLD2cLAepgiHPL8psnXkC0IRQr1sCSDgEnQlrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}