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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d2b9c88e3cfce161445505b1bf1d7319b393c64ceee1075366f3847bfdbd928' 
  AND token = 'R2EvIQWStmofou8i66sJ/gLEm3esdefTHfMCeXXAaaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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