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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc8e48a9e1461227deb6b576fa3e978c439f55c5ceede5eed6d2e520d55be3e7' 
  AND token = 'IQolEK0ryxBoG23iZNENh0eFO+FK0epAQx4oMeNWQi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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