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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ac90b3d5654f7a758391b048bfd437284dc3e8a808f0710f517a1236d40e005' 
  AND token = 'opMjbOic91SJyQdSMRiLvFct70Kv2J2OWCC9CrQNBBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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