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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8938603f7e2c5971cde599466b6dbdee823a88115f3ef35311b2d602dc4f99d' 
  AND token = 'ev3yaN0rRewa1qOdgJLQ+5KW7Tc57GF7czNztMH971Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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