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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a98ee067dedcb655c99add2d4a7ff55df6046ffa7e61e2884c43a6fe2baa565e' 
  AND token = 'KeI7/f2tLu5hL2V2roxcPYw/Bvyt/Tkif1OYYCRVmdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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