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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c006fd1cf1fa1ababf444fe9cb2e475d78a35ba40983d427ba7defc2e4c18d56' 
  AND token = 'a6NOWnV41dD3bckrT1zS5X1He6FF2d7ALIHpz3aXLtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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