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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e909234de50047c399afc58103f514c7fcb6a85a90b489765339b254e01073bc' 
  AND token = 'XHMxNfr4hCQxkzrHlgX6fT848KxGJq3tDnwcxUrNT2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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