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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6514d1cb55644003349074a30c9aca093cf676962a2e3732ea35a6d6fb39ec9' 
  AND token = 'HBRTIYq14Irq2b1fW31+t8UX6l8QJqbeHvFWa/K0cZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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