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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b64270a29ea928ede441fadc7f9275b30d1f7f0942727b4b2a44e574982519e' 
  AND token = 'HcrGYh4W3q49lOOCeya7oZwLwnX5cH0uzIxuk59jfdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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