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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f4645a012f3486c7a2a4fba1c2d473438aa22011807bf9de8c75b0c2313218e' 
  AND token = '9RAYIySrJmJLpxxNZKEcLvk3VdfosmRsBYx9xazU42g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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