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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8ef46b6e0887e5e6b56c368f22e1cc24374fce564de198aed8581e05656ca3d' 
  AND token = '3TTqFGSUX2J8tLr5mryuMDpL9i2+Lnfy0BoGbUp/Aes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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