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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62ef799e0b4f1e58b3eb25c8c040f2ec4f08ab2fb3c9c329e70bd732e84502c7' 
  AND token = 'j75bojzmCNidkpO1+xqwuVsl3fewb2lyGrwhae0KaNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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