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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c992a7079afeb3d8a9f405f5f90b5968015083db80449b76598352624ae986a9' 
  AND token = 'edsjL6kKF014oVVJqMt3Tdr3boC3qz2ehgddzjJGe4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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