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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfbf0cd98588c820c0c51b011a3008d536992f0dd4f3497c0e3b6f918cbc99e0' 
  AND token = '0PdlcL/Z3t8Ir3ZZY/7utGIgqmr9M5p9Cr5mryIiAWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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