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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c022f09f3925dab21f49cc44bb8ab2615a62cc03a791b1a20e67b0a1f99e29bf' 
  AND token = 'exj4gW7y6Roc357OGon16tUQ9qYylAT9SCJZ0xqbl/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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