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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc54d0bfcc2c0e1980df182344700f9d2efca319c439ccde8f36cc06765a285c' 
  AND token = 'fEonTf73bTS/Zd5SBAjIdhXsmj1memXO+TK9IxBqQOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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