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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9268c8cf3bcbd3e678bd9ab77cd97787fc91880d26daa85a4f698a1d1209b44c' 
  AND token = 'e8XcwFIaO7adiqtLUJTWUjs0KwvbGygAgR/416lF/OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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