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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c448bda3f3afbc8e515717a8df5bd019c07ac3a8790e7e3f90e8930e57996f2d' 
  AND token = 'NdKzkoSMXhSZOSpTlBDDNeCEFqc4fu9/23o2LlgDsuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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