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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0479d392df7133d33c1f6eafef633312ee5a5dd116a85aa6f6fed04a6b3d3188' 
  AND token = '+sC9Ui89RY9dU1EYsz8VbpxQdR94tGS+VdNb703S43Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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