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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d062dd3d4b8021a10804fdbe29fba784ae5f23c8822ebc606c587766fa508db' 
  AND token = '17Kk332AI6i0fwDQNWIHX8229Dt4UdqBnv12+deGA+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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