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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd801e77ea4220433cabee7a46c422f4a63043a2456eb3fac67ec6815241f65ce' 
  AND token = '0D+x8TRYz9bcPsSy3+3+iqnMGq0n/oUAJa58YuJe/LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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