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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a0a555f8c8b040eea3be5080da271eda4612f376771224616031163a46c778f' 
  AND token = 'ly3cJXJm4IhwhRtL3/NL8Znfy7KKklSpT7o19APwHm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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