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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d0043a9db00300a7e2cc24633f6ab84506fd9b899265560399b890f2a007c58' 
  AND token = '48fNfrfe38Ak0NL/iriqR3MNmNp1rcTjmizjbHpEwOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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