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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f85ecb0b3932e91ee83d11bf14f58acd142c26bac63c34a8e8180012fa39e9f0' 
  AND token = 'XANB/c0fZXK0vlbFh/yyeI/JqmWuwQEDh/9YtfPgQY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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