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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc7efa107bc21f02a8c05d39f2c0b234d46e6738339d9ff3876da21c76167e31' 
  AND token = 'rTDQfBfXatnW3ie9LXh5IDNBk5lqn24pc+h5e87PGYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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