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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fc8d1d4cc723371780df4c2e0dd51fde6f9d9066a5278db182f8b3d9080e4ea' 
  AND token = 'tIsh0q8q5y35nI5RIKWaSaIXyLj+8Yx57rDDI0VIrrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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