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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fea1faaccfbdc1fb2e7adac96a8c87c11541507ee0bbc76dba287701a6d36737' 
  AND token = 'e5ICqht7tgrygW2pptLWpiVhXRBv9URptqBqEU4XTBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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