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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc0591e15d6972740d91ec1b376f853782dd6ea320fb9b45dc87882d48afa1c8' 
  AND token = 'NneSMCxLGiIsbEirjJCXH6ygMT2VKcACxgAUrFinN1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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