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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9084e90872729a182f7af07f35a2c7590a07c164bf67789048b0b0312c218096' 
  AND token = 'YfRIIPTIh1b+k7ijTx5VNYtuqDv0ycNUB59ueBli+hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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