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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d0660c2f21117394c651ebae1838f70eb0827db48018e8654fc96be309e29b5' 
  AND token = 'Dge48TqFf9WJ+L26GC7xKG6lIckWHlBbN4kiI8sjMcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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