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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64be33de9cf4b01ddce2e74a6755b82387f1afb32135ca5b77d929b314b20468' 
  AND token = 'Vjcs9ccnHQ5lpwcNEosjCT2u3mZF9hbvjPwgCIkcv5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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