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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62920758f5fa177897414b3d964c3661e406eafcbfbf8e37a681c94a268d6ad9' 
  AND token = '7aarFmO6thb25c7FBSgt2w4oSvws+ntq6OZcYKkT89s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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