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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b618596c43e60bb766ffd1cb458f6eb87e96cfa62c19fafaa3aa242ea5b748df' 
  AND token = 'j1P1CWCHDB6LE1JdDLsC69Wv64jDGdebQT1/mRK+z3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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