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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '900030c5530cd6d1a517f54984477368591a6e46dcae6b6eb485d6e5e4d2d46c' 
  AND token = '0OCzsTV2r6ehyy4zyNdzpjf/KLgndmN7qKJsK8TrOs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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