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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de7f3c4dccc2edfe07bb5befdc685ac47db1109ec62799c95b7ba74333aacf50' 
  AND token = 'w36UNCoD7Cc2SNR152rknDZPXcBHDF0H/rZEoAfBwoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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