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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33217b0e293f4d63907ba520342525179acfec20ee40ed8ac6b8ee49c43bd380' 
  AND token = '0k0Y2yjdluCk6FIqEXmaGHRqRenLr8Z7g1NUji6HXxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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