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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87ee8f8080038900377fa9b3a26e178c478d97d4845d89ab1c5ff9a38520fcbf' 
  AND token = 'PC9Fb4/ZfvZcf44pdn2tgR5wSqNmomxU/3xyL740ZS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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