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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '648b0a629615293c244a3a9bb830dc25472c4d2c055d76821d228edb44ae459a' 
  AND token = 'NS2Z7lRMosLRolORnUm9MjKIiMGwpI7/Dwf1OJ94FNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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