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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b22f94903e7f4b04b13f595fd67c17e418658cd046f2b48c131807b7d9e1274' 
  AND token = '4SBZk4z/6Se5TrykeSUfSYBFx/KxbrXicfGO23XeDVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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