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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c28683b06c804f26df5c5254d8171584a36aefb697fdb7f4f8277a3f236e3c03' 
  AND token = 'EiN77FyABIwORuXKakdAE3JUZkqljMbFMUx1WyV7Ta4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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