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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '856a7cc3c4f56450b8dadd04494e8f27f5255bb061cefc21eacb9fd5890d345a' 
  AND token = 'QNBcW+fH+LModZDyAzRtDvwmYr5m/knttO6f3FHK+Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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