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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5557395a81f81e0c1fae172b71072b3a756be799f7b2edc3a8e618e7f7d5b07b' 
  AND token = 'NYdwxo4eIDV4EP0s3hyHrXqFdSNacXR26UANXSBxqJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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