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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2070304b6e49dbcf34257f4320b31bbf73e2f47bbf04ea7b7462c92a795674c4' 
  AND token = 'e8rSbwVgBx2/JSkGrb0VIBydcBM30HY/nWTJYPj1Eqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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