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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da48451c7d173f3a8f9de51fa9e7001e6c7805625aee4b6fec12d9ba6988df9e' 
  AND token = 'P8ihMAW7z2TrNetbTN/aKbJe5hejL3cMLFd2cMhRm+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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