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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec7f0763307c79cdce2d6bac0c6a3c4c4f9e9b6bff0543d0fe10d3fa2b31fc4b' 
  AND token = 'g6Bim/lK+9D4+oH7BXnd01wZsDhU6UghNh5+8M6mR30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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