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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0af892dc782310586d2a258c488e9a368bbfc1cfc8e8c7e2c7a59ae5c72146a0' 
  AND token = 'gVCLcw02y9ovJ6SC/JQFRP2spJIBQPpZ3CZtspJAwTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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