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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de40edb26cbe9be5784680a18025f19232c26d25bf5972d1e5642bf6ed0fb591' 
  AND token = '+m+fDYs/uAnLH4lNxEAcRik8zYKn36/H3ECaEIGjLao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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