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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '220f7eca99a2aa4a9bad77712353b03a2cc4fc5b8b95bb1a5fcf68b836189c43' 
  AND token = '3j7I00p7738y8PJR1VHZ+0yKjJZOVd2iiFKftQrUs5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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