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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5092ed0fccb3074ffbbc7ed7340248200f360b89fa4eee292a4686f4139df1bb' 
  AND token = 'vomsHE0Yeu7A0uxZ8N2EF+FGgKNqvz++x93k3fsIjH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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