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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9b66d398e4e08da8db6e6982c584ac804cd0022885d630454194c24c01c9404' 
  AND token = 'gCcCTrMPdaV1s1QUWjkvXRzKEGg6h83azl66s4SyYA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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