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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f92cae3e419e9c2601729bf7b2f8dfac8c36e125c662767d75f308e54e6e2468' 
  AND token = 'UeOebuK51/AyZTt6Ba2Y+KUgB9M3N1/M6BIfjK1kAIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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