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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4514a5b3ea5eaf0e9ea4a04f48b054480547b5bfff54fb23badc1b389bacde94' 
  AND token = 'HHO9CzLiIfwBFcXamC+S6ZVb6FRg6khrSVUllbPdcDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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